Conversions/ Sig Figs
What is the metric unit for mass, length, volume, and time?
gram, meter, liter, second
Define density and write its equation
Density is the measure of how tightly packed a substance is. D = mass / volume
Which of these elements is a metal?
A. Phosphorus
B. Xenon
C. Manganese
D. Sodium
C. Manganese
What is the atomic number of Copper and Lead?
Copper- Cu 29
Lead- Pb 82
Which of these has 3 sig figs? Select all that apply
A. 1.02
B. 1 x 10^3
C. 239
D. 0.01
A and C
How many milligrams are in 3.6 grams?
3600 mg
True/ False: liquids have a definite shape and definite volume
False. Liquids have definite volume but not definite shape (it takes shape of container)
True/ False: Atomic number is the number of protons in one atom fo an element
True
How many valence electrons are in an element of Oxygen?
6
How many sig figs would be in the answer to this calculation? 1.25 x 8.9
2
How many centimeters are in 3.4 inches?
8.6 cm
Describe how solids, liquids, and gases move
Solids: rigid, tightly packed, move slowly
Liquids: Tightly packed, but move slowly
Gases: Fast, far apart,
How many protons, neutrons, and electrons are in a single atom of Fluorine?
protons: 9
electrons: 9
neutrons: 10
Name one alkaline earth metal
Beryllium, magnesium, calcium, strontium, barium, or radium
Convert 87.5 Fahrenheit to K.
304. K
While solving a lab question, a student must solve for (7.69 x 3.8219). How many sig figs will be in the student's solution?
3
A zinc piece weighs 75.6 grams. When placed in 15.5 mL of water, the water rises to 29.6 mL. What is the density of zinc?
5.36 g/mL
Magnesium has three naturally occurring isotopes. Magnesium 24 is 78.70% abundant, Magnesium 25 is 10.13%, and Magnesium 26 is 11.17%. Calculate the atomic mass of Magnesium's naturally occurring isotopes.
24.32 amu
True/ false: Ionization energy increases as one moves down a group on the periodic table
False
How many kilojoules are in 70. Calories?
290 kilojoules
In one 22.6 serving of cereal is 8.05 grams are protein. Write a conversion factor for percentage of protein to cereal.
35.6 g protein/ 100 g cereal
A patient requires a 4.0 g dose of medication. How many mL will you need to administer? 1 dose of med = 1.5 g/mL
2.7 mL
Calculate number of neutrons in an element with an atomic number of 16 with a mass number of 42
26
Which element has the most metallic character?
A. Silicon
B. Magnesium
C. Bromine
D. Radium
D. Radium
True/ False: Copper pennies submerged in water is a homogenous mixture
False